Measuring the Dissolution of Cr and Fe at 550°-750°C in FLiNaK and FLiBe

Technical Report · Fri Sep 01 04:00:00 EDT 2023

DOI:https://doi.org/10.2172/2203032· OSTI ID:2203032

Pint, Bruce A. ^[1]; Sulejmanovic, Dino ^[1]; Pillai, Rishi ^[1]

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1. Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Assessing the compatibility of 316H stainless steel with molten fluoride salts has been identified as a key research topic for molten salt reactor development. Current developers are interested in 316H stainless steel due to its ready availability and ASME code qualification. Previous studies of 316H stainless steel compatibility in molten fluoride salts have shown general agreement that Cr is selectively removed from the alloy during the exposures in molten salts. However, the extent of Cr dissolution depends on the initial purity of the salt and Fe also readily dissolves in the salt. In order to model dissolution, it is necessary to understand how time and temperature affect the dissolution rates of the alloying elements which may lead to saturation of these elements in the salt. To study the dissolution of 316H, Cr and Fe specimens were exposed in FLiNaK and LiFBeF2 (FLiBe) salt at three different temperatures (550°-750°C) and three different durations (100-2000 h) in isothermal capsule experiments.

• Research Organization: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
• Sponsoring Organization: USDOE
• DOE Contract Number: AC05-00OR22725
• OSTI ID: 2203032
• Report Number(s): ORNL/SPR--2023/3169; M3RD-23OR0603031
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE